PIC24FJ128GA008-I/PT【PDF 12/258 页】IC PIC MCU FLASH 128K 80TQFP

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2005-2012 Microchip Technology Inc.

DS39747F-page 109

PIC24FJ128GA010 FAMILY

10.3

Input Change Notification

The input change notification function of the I/O ports

allows the PIC24FJ128GA010 family of devices to gen-

erate interrupt requests to the processor in response to

a Change-of-State (COS) on selected input pins. This

feature is capable of detecting input Change-of-States,

even in Sleep mode, when the clocks are disabled.

Depending on the device pin count, there are up to

22 external signals (CN0 through CN21) that may be

selected (enabled) for generating an interrupt request

on a Change-of-State.

There are four control registers associated with the CN

module. The CNEN1 and CNEN2 registers contain the

interrupt enable control bits for each of the CN input

pins. Setting any of these bits enables a CN interrupt

for the corresponding pins.

Each CN pin also has a weak pull-up connected to it.

The pull-ups act as a current source that is connected

to the pin and eliminate the need for external resistors

when push button or keypad devices are connected.

The pull-ups are enabled separately using the CNPU1

and CNPU2 registers, which contain the control bits for

each of the CN pins. Setting any of the control bits

enables the weak pull-ups for the corresponding pins.

When the internal pull-up is selected, the pin pulls up to

VDD – 0.7V (typical). Make sure that there is no external

pull-up source when the internal pull-ups are enabled, as

the voltage difference can cause a current path.

Note:

Pull-ups on Change Notification (CN) pins

should always be disabled whenever the

port pin is configured as a digital output.

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